FR2526906A1 - TORSION DAMPER DEVICE, IN PARTICULAR A CLUTCH FRICTION FOR A MOTOR VEHICLE - Google Patents

Abstract

THIS TORSION-DAMPERING DEVICE IS OF THE KIND COMPRISING TWO COAXIAL PARTS A, B, MOUNTED TO ROTATE WITH RESPECT TO ONE THE OTHER, AGAINST ELASTIC MEANS, AND WITHIN THE LIMITS OF ANGULAR TRAVEL DETERMINED BY SNAPS 32 PROJECTING FROM THE PERIPHERY OF THE HUB SHOULDER 11 OF THE COAXIAL PART A, THE SAID SHOULDERS 32 BEING EACH ENGAGED WITH CLEARANCE BETWEEN TWO AXIAL SHOULDERS 33R, 33T PROVIDED FOR THIS EFFECT ON THE CROWN 14 THAT PRESENTS THE COAXIAL PART B AROUND THE SAID HUB SHOULDER 11. FOLLOWING THE INVENTION, THE AXIAL SHOULDERS 33R, 33T THUS ASSOCIATED WITH EACH SHAFT 32 ARE FORMED BY THE SLICE OF CREVES 34T, 34R HOUSING CIRCUMFERENTIALLY IN THE CROWN 14. APPLICATION IN PARTICULAR TO CLUTCH FRICTIONS FOR INDUSTRIAL VEHICLES.

Description

The present invention relates generally to the devices

  torsion dampers having at least two

  coaxial parts rotatably mounted relative to each other

  within the limits of a defined angular deflection, and against circumferential interposed elastic means

between them.

  As is known, such a damping device usually enters into the constitution, for example, of a clutch friction, in particular for a motor vehicle, one of its coaxial parts then carrying a friction disk for

  to be secured in rotation with a first shaft, in practice

  that a driving shaft, the output shaft of the engine in the case of such a motor vehicle, while the other of its coaxial parts-is carried by a hub intended to be secured in rotation with a second shaft, in practice a driven shaft, for example the input shaft of a gearbox in the

  relevant case of a motor vehicle.

  Such a torsion damping device makes it possible

  to ensure a controlled transmission of the torque

  plicated to one of its coaxial parts when the other or the others thereof are themselves the object of a torque, that is to say to filter vibrations that may arise any along the kinematic chain, which goes from the engine to the driven wheel-shafts in the case of a

  motor vehicle, on which it is inserted.

  The present invention is aimed more particularly at the case

  o a first of the coaxial parts in question contains a

  the hub while a second of these coaxial parts comprises two washers, called guide washers, which are

  axially arranged each respectively on the one hand and the

  said hub web, and which are axially connected to one another

  to the other by a crown, this crown extending radially

  beyond the periphery of the hub web.

  Such an arrangement is described in particular in the

  French patent deposited on May 5, 1972 under No. 72 16111 and

  written in No. 2 183 390 as well as in the application for

  French patent filed October 14, 1981 under No 81 19298.

  Most often, the elastic means interposed circumferentially

  substantially between two coaxial portions of a torsion damping device being spring-like coil springs substantially tangentially disposed with respect to a circumference of the assembly, the ultimate value of the possible angular deflection between these two coaxial portions is determined by the coming to contiguous turns of some at least

of these springs.

  This inevitably results in a certain limitation

  for the maximum transmissible torque then of one of those parts

coaxial to the other.

  This couple transits through the springs that are

  wind with contiguous turns, and these, within which con-

  crushing stresses are added to the elastic torsional stresses, are usually in this case at most

from their mechanical possibility.

  To avoid such a limitation, and in particular, as

  is desirable for clutch friction intended for heavy commercial vehicle equipment, to enable the

  passage of an over-torque of one of the coaxial parts

  such clutch friction to each other after absorbing

  the maximum possible angular deflection between them,

  it has been proposed to radially equip the web with

  yeu, from place to place, on the periphery of the latter, said lugs being each individually engaged, with play, between

  two axial shoulders provided for this purpose on the crown

  axially bonding to one another the two associated guide washers.

  Such a provision, which therefore leads to a determination

  the ultimate value of the possible angular deflection

  be the two coaxial parts concerned by a circumferential stop

  positive ferment of such lugs against the shoulders

  corresponding axial axes of the associated crown, is

  described in French Patent No. 72 16111 and the application

  French Patent No. 81 19298 mentioned above.

  In practice, the axial shoulders to thus provide on

  the implemented crown are formed by the slices of

  intended for this purpose in the latter.

  This results in a certain weakening of this crown, as well as a certain complication for the assembly of the

  together, this arrangement may involve an initial presentation

* 6906

  the skew of the hub web relative to the crown, having

straightening of this hub veil.

  To overcome this last drawback, it has been proposed in the French patent application filed October 14, 1981 under No. 81 19298, to provide a radial offset of the free edge of the crown, at the price, therefore, of a increased complexity of it. The present invention generally relates to

  a provision which makes it easy to obtain

  looking for axial shoulders on such a crown and

  in addition to other advantages.

  More precisely, it relates to a device

  torsion damper, and for example a friction of embra-

  motor vehicle, of the kind comprising at least two coaxial parts rotatably mounted relative to one another;

  the other, within the limits of a determined angular deflection

  born, and against elastic means namely, a first

  coaxial portion, which comprises a hub web, and a second coaxial portion, which comprises two washers, said

  guide washers axially arranged each

  on both sides of the hub web, said guide washers being axially connected to each other by a ring which extends radially beyond the periphery of the hub web, and said hub web being provided radially,

  on its periphery, spurs, which are each individually engaged

  with play, between two axial shoulders of said neck

  this torsion damping device being in a manner

  general re characterized in that at least one of the axial shoulders that the crown thus has for each of the lugs of the hub web is formed by the edge of a flat burst

  circumferentially in said ring.

  Thanks to such a provision, the mechanical weakening

  the object of the crown due to the formation therein of the desired axial shoulders is minimal, any

  the material of said ring being retained.

  In addition, the axial shoulders thus formed by punctured on the ring being themselves offset radially relative to the current portion thereof, it is no longer necessary to obtain an axial engagement of the hub web in the 5 to 6906, of any radial offset of the free edge thereof. Moreover, with equal total radial space, the sail of

  hub can, between the axial shoulders of the crown, pre-

  if desired, a larger diameter, without the possibility that it presents an axial engagement in the crown is modified. Moreover, since the formation of punctums according to the invention in the ring inevitably leads to a hardening of the material constituting it, this ring advantageously has an increased mechanical strength at the expense of

  each of the axial shoulders it has for cir-

  conferring the lugs of the associated hub veil.

  Finally, in the case where, for its subjection to the ring, one of the guide washers presents radially

  protruding at its periphery, from place to place,

  designed to be engaged in notches provided for this purpose

  on the corresponding edge of said crimping ring

  wise of the assembly, the axial shoulders of said crown may advantageously be circumferentially arranged

  on both sides of such indentations.

  The features and advantages of the invention

  from the following description,

  for example, with reference to the appended diagrammatic drawings in which: FIG. 1 is, with a local cutaway, a view in

  raising of a torsion damping device according to the

  vention, along the arrow 1 of Figure 2; Figure 2 is an axial sectional view along the broken line Il-Il of Figure 1; Figure 3 shows, on a larger scale, the embodiment detail represented by an insert III in Figure 2; FIG. 4 is, on the scale of FIG. 3, a partial cross sectional view of the damping device of FIG.

  torsion according to the invention along the line IV-IV of the

  Figure 3; Figure 5 is a partial perspective view of the hub web that includes the torsion damping device and the crown associated therewith; Figure 6 is a diagram illustrating the operation of the torsion damping device according to the invention; FIG. 7 is a view similar to that of FIG.

  4 and relates to an alternative embodiment.

  These figures illustrate by way of example the application of the invention to the constitution of a clutch friction

for a motor vehicle.

  In the embodiment shown, this clutch friction generally comprises two coaxial parts A,

  B rotated one against the other, within the limits of

  with a certain angular deflection, and against

elastic means.

  In the embodiment shown, the coaxial portion

  the A comprises a hub 10, and, transversely, a web of

  annular hub 11, integral with the hub 10.

  For example, and as shown, the hub veil 11

  can be in one piece with the hub 10, in the metal zone

diane of it.

  Together, in the embodiment shown,

  the coaxial portion B comprises, transversely, two washers

  the 12, 12 ', commonly called guide washers, which are

  axially arranged each respectively on the one hand and the

  be of the hub veil 11, at a distance from it.

  These guide washers 12, 12 'are axially connected to one another by a ring 14, which extends radially

  beyond the periphery of the hub web 11.

  In the embodiment shown, this crown

  14 is in one piece with the guide washer 12, the

  For example, it seems to come from the same appropriately cut and stamped blank, and, as a corollary, the guide washer 12 'radially, at its periphery, from place to place, tenons 15, through which it is engaged, and crimped, in notches 16 provided for this purpose on the crown 14, the

  along the free edge 17 thereof, for example according to

  positions of the type described in the French patent application filed December 13, 1977 under No. 77 37511 and

published under No. 2,411,999.

  For example, and as shown, nine tenons 15,

  In this case, the circumferentially distributed guide ring 12 'can be provided 516906 at the periphery of the guide ring 12'.

  having an equal number of indentations 16.

  In the case of clutch friction for a vehicle

  tomobile, the coaxial part B thus constituted carries a dis-

  friction 18. This is formed of a veil 20, which is in practice

  circumferentially divided into blades, and which, at its

  internal phery, is reported by rivets 21 on the rondel-

  the guide 12, on the face thereof opposite to the rondel-

  12 ', while, at its outer periphery, it is provided, laterally, and on both sides, with

friction 22.

  The elastic means against which can be de-

  velopper an angular displacement between the coaxial portions A, B thus formed are interposed circumferentially between them, and are formed in the embodiment example

  represented by springs 24, 24 ', of the spring-loaded type

  din, extended substantially tangentially to the same circumference

of the whole.

  In the embodiment shown, the springs 24 are six in number, and, grouped in pairs, they alternate with the springs 24 ', which are three in number, the whole

  being regularly distributed circularly.

  The springs 24 are arranged partly in windows

  25 of the hub web 11, and partly in the housings 26 provided for this purpose in the guide washers 12, 12 ', said housing 26 resulting, in the embodiment shown, axial embossings arranged alternately in one direction and in the other in these guide washers 12, 12 ',

  in correspondence of one to the other of these.

  In practice, in the embodiment shown, the springs 24 are engaged without circumferential clearance both in the windows 25 of the hub veil 11 and in the housing

  26 guide washers 12, 12 '.

  In a similar arrangement to the previous one, the springs 24 'are partly arranged in the windows 25' of the hub web 11 and partly in the housings 26 'of the

guide washers 12, 12 '.

  But, if they are engaged without circumferential play in the 6906

  housings 26 'of the guide washers 12, 12', a circumferential play

  conference is planned for the rest position of the

  ble, between, on the one hand, their circumferential ends,

  and on the other hand, the corresponding circumferential ends

  windows 25 'of the eye of the eye 11.

  For the circumferential direction corresponding to a function

  drawing of the latter, which is also the meaning of

  normalization of the set, as indicated by the arrow F

  in FIG. 1, this circumferential clearance has the value JT.

  For the opposite circumferential direction, which corresponds to a

  functioning in retro of all, it has the value JR.

  In the embodiment shown, the cir-

  JT and JR conferencing have the same value, but it's not

necessarily so.

  Furthermore, in the embodiment shown, the springs 24, 24 'are double, each of these springs being in practice formed of two coaxial springs of the same length but of different diameters, respectively 241, 242 f and 24'

24 '2, arranged one in the other.

  In the embodiment shown, the clutch friction concerned is completed by friction means acting axially between the two coaxial parts A, B

who constitute it.

  In this embodiment, this is a washer

  the friction 28, which, applied to the hub web 11, for example the side of the guide washer 12, is carried by a support washer 29 set in rotation, by legs

  axial 30, on this guide ring 12.

  An elastic washer with axial action 36, of the type of

  sold for example under the commercial name

  "ONIYUFLEX" is interposed axially between the washer

  port 29 and the guide washer 12, for soliciting

  manente the friction washer 28 in contact with the veil

hub 11.

  These arrangements are well known in themselves, and not forming part of the present invention, they will not be

not described in more detail here.

  In a manner also known per se, for delimiting the possible angular displacement between the coaxial parts A, B, the hub web 11 is provided radially at its periphery,

  from place to place, 32 pins that are engaged, each indicated

  alternatively, between two axial shoulders 33 T, 33 R provided for this purpose on the ring 14, with, for the rest configuration of the assembly, a circumferential clearance, J'T, in one direction, which corresponds to the running operation of all, and IR in the opposite direction, which corresponds to a functioning in

retro said set.

  In the embodiment shown, the games circumferentially

  I RE, -J'R are equal to each other, but, as

  but it is not necessarily so.

  Anyway, these games J'T, J'R are respectively

  superior to previous JT, JR games.

  According to the invention, at least one of the axial shoulders

  33 T, 33 R that presents the crown 14 for each of the er-

  gots 32 of the hub web 11 is formed by the slice of a cre-

  34 T, 34 R circumferentially arranged in said ring 14. Preferably, and as shown, this is so in practice for each of the associated axial shoulders 33 T, 33 R

at each of the lugs 32.

  In the embodiment shown in the figures

  1 to 6, each of the punctures 34 T, 34 R of the crown 14 is trans-

  in the form of a gutter, this puncture having transverse

  a uniform section throughout its circular extension.

  conferring, and therefore being open to both

  of its circumferential ends.

  Preferably, and as shown, each of the punctured

  34 T, 34 R that the crown 14 is circumferentially offset

  relative to the indentations 16 thereof, and in practice the two punctures 34 T, 34 R that the crown 14 presents.

  for each of the lugs 32 of the hub plate 11 extend each

  cun respectively on either side of such an indentation

16 of it.

  However, in the embodiment shown, it

  there is only a small number of pins 32 relative to the notches

  res 16, this number being for example six, as shown.

  As will be noted, the slats 34 T, 34 R presented by the ring 14 are very easily formed by simple deformation

2526 * 06

  locality of the latter, with shearing at the circumferential ends.

  such festering, but without removal of matter.

  The integrity of the crown 14 is thus advantageously

practically preserved.

  Of course, the punching tool to be used is radially engaged, from the outside. As will also be noted, in its running portion, the ring 14 retains a simple configuration which, in cross-section, is generally straight. , without any

  radial offset of its free edge 17.

  As will be noted, finally, the punctures implemented according to the invention for the formation of axial shoulders

  33 T, 33 R advantageously, when mounting the en-

  seems to be a straight presentation of the hubcap by

  port to the crown 14, which facilitates this assembly, and, the

  the hub 11 once thus in place in the ring 14, it surrounds it peripherally integrally, including the right of its lugs 32, which provides good protection

of these.

  In use, the coaxial part B constitutes in practice an exciting part, its friction disc 18 being intended to be clamped axially, by its friction linings 22,

  between two plates connected in rotation to a driving shaft, the

  motor output in the case of a motor vehicle, and, together, the coaxial part A is an excited part, its hub 10 being intended, generally by a mounting

  grooves, to be rotatably connected to a driven shaft, for example

  ple the input shaft of a gearbox in the case of a

such a motor vehicle.

  If a rotation torque is then applied to the coaxial part B along the arrow F of FIG. 1, this coaxial portion B drives the coaxial portion A.

  But only the springs first intervene 24.

  After absorption of the mounting preload that

  usually feel these in their housing, these springs 24 yield elastically, so that an angular displacement develops between the coaxial portion B and the coaxial portion A in the direction of rotation of the assembly, as illustrated by the diagram of Figure 7 on which the angular deflection

  D is reported on the abscissa and the transmitted torque corre-

C on the ordinate.

  For a value dl of the angular displacement D, correspond to

  Due to an absorption of the circumferential clearance JT, the springs 24 'in turn come into action, after absorption, as

  previously, of their prestressing, and by adding their ef-

  fets to those of previous 24 springs, which remain compressed.

  Finally, for a value d 2 of the angular deflection D cor-

  corresponding to an absorption of the circumferential clearance IT, the lugs 32 of the hub web 11 come into contact with the shoulders

  corresponding axial axes 33 T of the ring 14, by circular stop

between them.

  There is then a positive training of the coaxial part.

  the A by the coaxial part B, without intervention of the springs

  24, 24 ', which remain however compressed.

  As a result, an over-torque can then be transmitted from the coaxial portion B to the coaxial portion A.

  For a decreasing sense of evolution of the couple, the pro-

cessus is reversed.

* Such an operation is well known by itself, and it

  will not be described in more detail here.

  Of course, to simplify the diagram of the

  6, no account has been taken of the effects of

  hysteresis due to the friction washer 28.

  As we know, these hysteresis effects lead,

  for the same value of angular deflection D, at a different

  ference of the value of the transmitted torque for the sense of

  increasing evolution of this couple vis-à-vis its value for

its decreasing sense of evolution.

  In the variant embodiment illustrated in FIG. 7, each of the punctures 34 T, 34 R that the ring 14 presents for each of the lugs 32 of the hub plate 11 is in the form of an olive quarter, such a puncture being not open. than at one of his

  circumferential ends, to which he forms the shoulder-

  33 T, 33 R corresponding, while it is closed

to the other of these.

  These punctures 33 T, 33 R then have a transverse section.

  dirty that goes down from their circumferential end

  open at their closed circumferential end.

  t 526906 The punching tool to be used is found

  advantageously simplified, a single shear being ensured

for each puncture.

  In addition, in this embodiment, the average circumferential lines of one and the other of the two punctures 33 T, 33 R that the ring 14 presents for each of the lugs 32 of the hub plate 11, which are materialized by the section lines of Figure 7, are both rectilinear and are substantially in the extension of one another, such

that visible in this figure 7.

  In the above, there is advantageously, axially, continuity of material for the crown to the right of each

  used, apart from the person or persons

  circumferential treness (s) thereof.

  It would not be outside the scope of the present invention to give these punctures the configuration of circumferentially elongated tabs between two circumferential slots, but these, axially interrupting the material continuity of the ring, the mechanical strength of the assembly.

it is lessened.

  Of course, the present invention is not limited to

  their steps to the embodiments described and shown, but encompasses any variant of execution and / or combination

of their various elements.

  In addition, the field of application of the invention is not limited to torsion damping devices having only two coaxial parts rotatably mounted relative to each other, but also extends to the case where a greater number of coaxial parts, rotatably mounted in pairs, is provided within such a torsion damping device. t 526906

Claims (8)

REVENDI CATI ONS   1 Torsion damping device, in particular clutch friction for a motor vehicle, of the type comprising at least two coaxial parts (A, B) rotatably mounted relative to one another, within the limits of an annual deflection determined, and against elastic means, to   namely, a first coaxial part (A), which comprises a   the hub (11), and a second coaxial portion (B), which comprises two washers (12, 12 '), called guide washers,   axially arranged each respectively on the one hand and the   said hub web (11), said guide rings (12, 12 ') being axially connected to each other by a ring (14) which extends radially beyond the periphery   hub web (11), and said hub web (11) being   radially, at its periphery, lugs (32), which are   each individually, with clearance, between two axial shoulders (33 T, 33 R) of said ring (14), characterized in that   at least one of the axial shoulders (33 T, 33 R)   thus feels the ring gear (14) for each of the lugs (32) of the hub web (11) is formed by the slice of a flat tire (34 T,   34 R) arranged circumferentially in said ring (14).   2 torsion damping device according to the invention   1, characterized in that each of the axial shoulders   (33 T, 33 R) that presents the crown (14) for each of the er-   gots (32) of the hub web (11) is formed by the edge of a flat tire (34 T, 34 R) arranged circumferentially in said crown (14).   3 Torsion damping device according to any one   conque of claims 1, 2, characterized in that a flat   (34 T, 34 R) of the crown (14) is transversely shaped   gutter and is open to both of its extremes. circumferential tees.   4 torsion damping device according to any one   conque of claims 1, 2, characterized in that a flat   (34 T, 34 R) of the crown (14) is quarter-shaped olive   and is open only at one of its circumferential ends   , to which it forms the axial shoulder (33 T, 33 R) cor-   sponding. Torsion damping device according to claim 2, characterized in that the circumferential middle lines of the two punctures (34 T, 34 R) presented by the ring gear (14) for the same spur (32 ) of the veil   hub (11) are both rectilinear and are   in the extension of each other.   6 Torsion damping device according to any one   shell of claims 1 to 5, wherein notches   (16) are provided on the edge of the ring (14) for   at least one of the guide washers (12, 12 '), characterized in that each of the slats (34 T, 34 R)   such a ring (14) is offset circumferentially   tally with respect to such an indentation (16).   7 torsion damping device according to the   2 and 6, taken together, characterized in that the two flat (34 T, 34 R) that the ring (14) presents for   each of the lugs (32) of the hub web (11) extends each   cun respectively on either side of an indentation (16) of such a crown.   8 Torsion damping device according to any one   one of claims 1 to 7, characterized in that, axially,   For the Crown (14) there is continuity of   re to the right of each one of the dead ones (34 T, 34 R) which it comprises, disregarding the circumferential end or ends of these.